just like the title says, I was wondering what everyone is doing for fuel and spark control with boosted applications. Granted I've got an LT1, but I'm just trying to get an idea of my options. I'm planning on doing a single turbo project as I posted about a few months ago, but I would rather not have to go to an aftermarket computer unless I have to. I know I can get a 2 or even 3 bar MAP sensor, but then what happens to the MAF? suggestions?

 

I have a Holley Commander 950 controlling my TPI. I'm already running a 3 bar MAP (I'd run a 2, but the 3 was free so Yay!!) sensor, and the system doesn't use a MAF sensor. Almost all cars use one or the other, but not both. There are advantages and disadvantages to both ways...I like to look at the positive of being able to blow off to atmosphere with the MAP system. MOST modern cars use MAF systems for their better overall tuneability.

 

I'm running a Megasquirt ecm. For those that havent heard of it, its a DIY fuel/timing computer, developed as an open project headed up by Bruce Bowling and Al Grippo. Basically For the cost of the board they sell ($15 or something) and a bunch of digikey parts ($25-30) you can have a functioning ecm. It will support real time tuning adjustments on 8x8 fuel and spark maps, with wideband support, and can support just about any engine combo you can think up. Its a SD setup, and uses mostly gm sensors, and an on-board 3-bar map for boosted applications.

Im using slightly different embedded code that allows the use of ford (!) EDIS parts (multiple spark, wasted spark distributorless ignition). This comes at the expense of fast idle control.

Its very good for a budget system. It definitely has its limitations and can be considered a little less refined than a $3k FAST setup or the like, and takes a considerable amount of research and work for it to function properly. I dont believe you can beat the price though. I would estimate I have under $300 in the whole setup, including the ignition parts.

 

probably should have some links:

http://www.bgsoflex.com/megasquirt.html
http://www.jsm-net.demon.co.uk/megasquirtnedis/
http://www.msefi.com/index.php?c=2
http://www.thegebharts.com/megaignite.html

 

If your not boosting beyond 2-bar, then put a 2-bar in it and get some resolution back. You might notice your part throttle and cruise areas respond a bit smoother.


As far as the topic goes, '749 running $58 or $60 (depending on the day of the week)
-- Joe

 

I know that should be the case in theory, but in all reality I didn't notice any difference between the 1 bar and the 3 bar even without boost (once I re-tuned it with the 3 bar that is). Also, the alcohol injection kit I'm looking at recommends a 3 bar sensor for its control module.

 

in talking to holley the commander 950 with 3 bar map can run a boosted motor just fine, i think it really depends on what you want to spend

 

Using a modified 749 with SVO brown tops, $58 or now really using Grumpy's $60 source code. Running a 2 bar bin/MAP.

BW

 

a few ??? about the commander 950.

-can a maf be used with it
-is there a harnis the hook an ls1 up to the 950 unit

You guy with the 950 unit, how much do you like it, or if at all? ,was it worth it?

thank

 

using a FAST ECM with wideband.

 

Stock ECM

 

DFIV-7 with a wideband